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MSD Servo Drive DC-AC Operation Manual
62
Id.-No.: CA97554-001 Date: 06/2012
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Example with three axes
AC-AC axes
AC-AC servo drive
as supply
Power
supply unit
Components 3x G392-024
3x mains choke
3x braking resistor
2x G393-024
1x G392-060 with
- mains choke
- braking resistor
3x G393-024
1x G396-050
1x LCL-Set
Investment costs 100% 108% 163%
Energy saving
1)
- 5% 10%
Electric price 0.1264€/kWh
2)
Operating time 16hours per day, 20 days per month
Amortization of
additional cost
after
- 6months 23months
1) Compared to AC-AC axes; this value need to be determined individually for each application
2) German Federal Association of Energy Consumers; electricity price comparison I/2011 for small and medium-sized indus-
trial customers; average electricity price, federal states in former West Germany
Table A.2 Financial calculation for three axes
Example with six axes
AC-AC axes
AC-AC servo drive
as supply
Power
supply unit
Components 6x G392-024
6x mains choke
6x braking resistor
5x G393-024
1x G392-143 with
- mains choke
- mains filter
- braking resistor
6x G393-024
1x G396 -110
1x LCL-Set
Investment costs 100% 115% 142%
Energy saving
1)
- 5% 10%
Electric price 0.1264€/kWh
2)
Operating time 16hours per day, 20 days per month
Amortization of
additional cost after
- 11months 16months
1) Compared to AC-AC axes; this value need to be determined individually for each application
2) German Federal Association of Energy Consumers; electricity price comparison I/2011 for small and medium-sized indus-
trial customers; average electricity price, federal states in former West Germany
Table A.3 Financial calculation for six axes
A.5 Functional comparison
The technical and functional differences between operation with an AC-AC servo drive
as the supply source and operation with a power supply unit are compared here as an
aid to selection.
Feature
AC-AC
servo drive
as supply
Power
supply unit
Operation on a wide variety of mains voltages worldwide pos-
sible
1)
Regenerative (sinusoidal)
Operation possible with any simultaneity factor
DC link via rail system (Size 1 - Size 5)
Power equalization by central DC link
Controlled shutdown in case of power failure
Requires external step-up and input reactors
Requires external braking resistor
2)
Air cooling
Liquid cooling
Higher DC link voltage (650 V/770 V)
Reactive current compensation
EtherCAT, SERCOS II & III, PROFINETIRT, VARAN, CANopen,
Profibus-DPV1
Sin/Cos encoder, TTL encoder simulation/TTL master encoder
= applicable, = partially applicable
1) With autotransformer
2) For emergency running in case of power failure
Table A.1 Functional comparison
A.6 Financial calculation
Alongside the functional advantages, a multi-axis system also offers ecological and
financial benefits based on the energy saving. Depending on the application, higher
investment cost can be amortized quickly thanks to the reduced power consumption.
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